Apply suggestions from code review

Co-authored-by: Vero <[email protected]>

code/modules/mob/living/carbon/xenomorph/abilities/lurker/lurker_powers.dm

@@ -292,9 +292,9 @@
 		isxeno(hit_target) ? SPAN_XENODANGER("We slam into an obstacle!") : SPAN_HIGHDANGER("You slam into an obstacle!"), null, 4, CHAT_TYPE_TAKING_HIT)
 		hit_target.apply_damage(MELEE_FORCE_TIER_2)
 		if (hit_target.mob_size < MOB_SIZE_BIG)
-			hit_target.apply_effect(0.5, WEAKEN)
+			hit_target.KnockDown(0.5)
 		else
-			hit_target.apply_effects(0.5, SLOW)
+			hit_target.Slow(0.5)
 	/// To reset the direction if they haven't moved since then in below callback.
 	var/last_dir = xeno.dir
 
@@ -306,7 +306,7 @@
 	addtimer(CALLBACK(src, PROC_REF(reset_direction), xeno, last_dir, new_dir), 0.5 SECONDS)
 
 	hit_target.apply_armoured_damage(get_xeno_damage_slash(hit_target, xeno.caste.melee_damage_upper), ARMOR_MELEE, BRUTE, "chest")
-	hit_target.apply_effect(0.5, SLOW)
+	hit_target.Slow(0.5)
 
 	hit_target.last_damage_data = create_cause_data(xeno.caste_type, xeno)
 	log_attack("[key_name(xeno)] attacked [key_name(hit_target)] with Tail Jab")